#include <fmt/format.h>  // literals

int main () {
    int i = 2; 
    double d = 4.567;
    fmt::print("{x} + {x}\n", fmt::arg("x",d));
    fmt::print("{pi} * {0}\n", i, fmt::arg("pi",3.14));
    using namespace fmt::literals;
    fmt::print("{y} | {x}\n", "x"_a=i, "y"_a=d);
}
